Thin display device

ABSTRACT

Provided is a technique related to a thin display device having a frame structure in which accuracy is ensured. First and second restricting convex portions ( 84, 85 ) are formed on the inner parts of a bending hole portion ( 83 ). A restricting face ( 84   a ) which is an end portion of the first restricting convex portion ( 84 ) takes an angle of 45 degrees sloping from upper left to the lower right. A restricting face ( 85   a ) which is an end portion of the second restricting convex portion ( 85 ) takes an angle of 45 degrees sloping from upper right to lower left. When bending processing is performed, the restricting face ( 84   a ) of the first restricting convex portion ( 84 ) abuts against the restricting face ( 85   a ) of the second restricting projection portion ( 85 ).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional of copending U.S. application Ser. No.14/113,985 filed on Oct. 25, 2013, which is the National Phase ofPCT/JP2012/060557 filed on Apr. 19, 2012, which claims priority under 35U.S.C. 119(a) to Patent Application No. 2011-099034 filed in Japan onApr. 27, 2011, all of which are hereby expressly incorporated byreference into the present application.

TECHNICAL FIELD

The present invention relates to a thin display device and, for example,relates to a thin display device suitable for a liquid crystaltelevision or the like and a tablet display device.

BACKGROUND ART

In recent years, televisions have become thinner and more lightweight,and as to relatively lightweight ones such as 20-inch ones, a pluralityof portable types have been also released. In the case of the portabletypes, it is required to make much thinner and more lightweight and isfurther required to have a stylish shape compared to stationary types,so that a narrow frame region is also required.

For example, there is a technique to provide a molding and processingmethod capable of molding and processing an exterior cabinet for a thindisplay device with high accuracy easily (refer to Patent Literature 1).In this technique, metallic processing material in which partscorresponding to a frame portion and a cover portion of the exteriorcabinet are formed along a longitudinal direction is cut in prescribedlength. In addition, the part corresponding to the cover portion of thecut processing material is cut at plural points to form a V-shapednotch. The part opposing to the notch is processed to be bent to formthe frame-shaped exterior cabinet.

CITATION LIST Patent Literature

PATENT LITERATURE 1: Japanese Laid-Open Patent Publication No.2010-266623

SUMMARY OF INVENTION Technical Problem

In the meantime, a liquid crystal television generally has aconfiguration in which optical members such as a panel and an opticalsheet are fixed by a metallic square frame called bezel in an envelopedmanner, which is covered by a cabinet in many cases. However, in orderto realize being thin, lightweight and a narrow frame region asdescribed above, a configuration not in the frame configuration of thebezel as described above has been required.

Moreover, there is also a case where a portable TV which is relativelysmall has four corners of a product in a rounded shape to some extentfrom the viewpoint of the design, and in that case, it is necessary tomake contrivance ensuring roundness of the corners while defining abending angle of a frame accurately. In addition, in a portable TV,there is a case where a protection cover is attached on the surface forpreventing break of a panel, and it is required to make contrivancepreventing a gap when attaching the protection cover to a frame.

In the technique disclosed in Patent Literature 1, it is possible tocreate a frame of a television by making cuts in an extrusion moldedproduct. However, there is a problem that it is impossible to ensure abending angle while making predetermined bending R in a bending portion,and other techniques have been required.

The present invention has been made in view of the above situations, andan object thereof is to provide a technique solving the above problem.

Solution to Problem

A thin display device according to the present invention is providedwith a metallic frame, wherein the frame is configured by connecting aplurality of frame members subjected to bending processing, in a partsubjected to the bending processing, a hole portion for bendingprocessing and two restricting means that restrict an amount of thebending processing to a predetermined amount by a V-Cut shape separationbefore the bending processing and by abutting each other at the time ofprocessing are formed, and wherein the hole portion is configured as along hole which is long in its longitudinal direction of the framebefore the bending processing, and a part of the fringe of the long holeis configured as the V-cut shape separation.

Advantageous Effects of Invention

According to the present invention, it is possible to provide atechnique related to a thin display device having a frame configurationin which accuracy is ensured.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a plan view showing external view of a liquid crystaltelevision according to an embodiment.

FIG. 2 is a side view showing external view of the liquid crystaltelevision.

FIG. 3 is a rear view showing external view of the liquid crystaltelevision.

FIG. 4 is a disassembled perspective view showing external view of theliquid crystal television according to the embodiment.

FIG. 5 is a plan view of a frame according to the embodiment.

FIG. 6 is a side view of the frame.

FIG. 7 is a plan view of the frame in a separated state according to theembodiment.

FIG. 8 is a side view of the frame in the separated state.

FIG. 9 is a rear view of the frame according to the embodiment.

FIG. 10 is a rear view of the frame in the separated state.

FIG. 11 is a perspective view of a corner portion of the frame accordingto the embodiment.

FIG. 12 is a detailed plan view of the corner portion of the frameaccording to the embodiment.

FIG. 13 is a detailed cross-sectional view of the corner portion of theframe.

FIG. 14 is a cross-sectional view taken along X-X of FIG. 12.

FIG. 15 is a cross-sectional view taken along Y-Y of FIG. 12.

FIG. 16 is a view of a rear face side of the corner portion of the frameaccording to the embodiment.

FIG. 17 is a cross-sectional view taken along A1-A1 of FIG. 16.

FIG. 18 is a cross-sectional view taken along A2-A2 of FIG. 16.

FIG. 19 is a rear view of the frame and a connection member according tothe present embodiment.

FIG. 20 is a cross-sectional view of the frame and the connectionmember.

FIG. 21 is a plan view of the corner portion of the frame according to amodified example of the embodiment.

FIG. 22 is a plan view of the corner portion of the frame after bendingprocess.

FIG. 23 is a plan view of the corner portion of the frame according to amodified example of the embodiment.

FIG. 24 is a plan view of the corner portion of the frame according toanother modified example.

FIG. 25 is a plan view of the corner portion of the frame according toyet another modified example.

FIG. 26 is a perspective view of the corner portion of the frameaccording to a modified example of the embodiment.

FIG. 27 is a cross-sectional view of the corner portion shown in FIG.26.

DESCRIPTION OF EMBODIMENTS

Next, description will hereinafter be given specifically for modes forcarrying out the present invention with reference to drawings. Thefollowing explains as an example a liquid crystal television as a thindisplay device, however, of course, it is also possible to apply to aliquid crystal monitor and a mobile terminal (a mobile phone or a tabletdisplay device).

A summary of the points of the present embodiment is as follows.

(1) A part corresponding to a cover portion of metallic processingmaterial is cut out at the plural points. A part corresponding to aframe portion of the cut-out part is bent-processed, and an exteriorcabinet (frame) in the form of a frame is molded using the processingmaterial subjected to bending processing. The cut-out part has a partnear the bending in a wide hole shape and has a part away from thebending in a shape adhered at the completion of bending so as torestrict a bending angle accurately.

(2) Predetermined uneven thickness is put on the part near the bending.

(3) There are two bending parts per one member.

(4) Connection of the members is performed through a connection member.

FIGS. 1-3 are views showing external view of a liquid crystal television10 according to the present embodiment. In addition, FIG. 4 is adisassembled perspective view of the liquid crystal television 10. Theliquid crystal television 10 is provided with as an exterior aframe-shaped frame 20 which is an exterior side face cabinet, atransparent protection cover 30 in the front side, and a rear cabinet 40in the rear side. In addition, inside the exteriors, a front cabinet 35,a sheet group 50 and a back light chassis 60 are arranged from the sideof the transparent protection cover 30.

The frame 20 is a molded component by a metallic processing member (byprocessing extruded material or drawing material). Though descriptionwill be given below for the detailed configuration, for example, in thecase of a 20-inch class, a rough size is about 490 mm width×about 290 mmheight.

The transparent protection cover 30 is, for example, a glass plate andprotects the sheet group 50. The rear cabinet 40 is molded with resinmaterial.

The front cabinet frame 35 is molded with resin material to have thesubstantially same size and shape with the frame 20, and is attached tothe rear face side of the frame 20. Note that, in the frame 20, acylindrical positioning projection portion 25 is formed at apredetermined position to extend in a back direction. On the front faceside of the front cabinet frame 35, a positioning boss hole 37 isprovided corresponding to the positioning projection portion 25.Further, in four corners of the front face side of the front cabinetframe 35 (the frame 20 side), a fitting convex portion 39 fitting in abending hole portion 83 of the frame 20, which will be described below,is provided.

The sheet group 50 has a liquid crystal panel 51, a Df sheet 52, a lenssheet 53, a light guide plate 54, a diffusion sheet 55, and a reflectionplate 56 arranged in a laminated form from the front side.

The back light chassis 60 is such that a metallic plate-shaped body isprocessed to have a predetermined shape, in which a light source (forexample, an LED edge light), a video driving circuit, a battery and thelike, which are not shown, are arranged.

Subsequently, description will be given specifically for the frame 20which is characteristic to the present embodiment.

FIGS. 5 and 6 and FIGS. 7 and 8 show plan views (FIG. 5 and FIG. 7) andside views (FIG. 6 and FIG. 8) of the frame 20. Note that, FIGS. 7 and 8show a state where the frame 20 is separated. Moreover, FIGS. 9 and 10show rear views of the frame 20.

As illustrated, the frame 20 is configured by a first frame 70 and asecond frame 80, which are connected by a connection member 90.Specifically, the first frame 70 in the upper side and the second frame80 in the lower side are connected integrally by the connection member90 at two points of the both side faces of the rear face part.

Each of the first frame 70 and the second frame 80 is molded from anextruded member (which may be a drawing member) such as aluminum alloyor stainless steel. Specifically, in order to allow the partscorresponding to the four corners (hereinafter, referred to as cornerportions) to be bent, the frame 20 of the extruded material in apredetermined cross-sectional shape is subjected to the processing ofthe predetermined cut-out shape, and is further subjected to bendingprocessing with R of the predetermined size.

An enlarged perspective view of the corner portion is shown in FIG. 11.Since the four corners all have the same shape, the bending part of thefirst frame 70 and the bending part of the second frame 80 havesubstantially the same shape, so that description will be given belowmainly for the second frame 80 as a representative, if not otherwisespecified. Moreover, FIG. 12 shows the state of the corner portionbefore bending processing, and FIG. 13 shows the state of the cornerpotion after the processing. In addition, FIG. 14 shows across-sectional view taken along X-X of FIG. 12 and FIG. 15 shows across-sectional view taken along Y-Y of FIG. 12.

In the second frame 80, the extruded material of aluminum alloy isfirstly cut in the predetermined length according to a size of theliquid crystal television 10. The cross-sectional shape is configured bya protection cover arranging portion 87 (a front face part of a bottomportion 81 and a side portion 82) on which the transparent protectioncover 30 is arranged, an outer peripheral projection portion 86 that isin a projected state to be one-step higher than the protection coverarranging portion 87 in the outer peripheral part, and a frame side faceportion 88 that is exposed as a side face of the liquid crystaltelevision 10. In other words, the shape is not an L-shape but a T-shape(the state being set down on its side). The outer peripheral projectionportion 86 is set according to thickness of the transparent protectioncover 30 and, for example, has about 1.5 mm height.

Subsequently, in the second frame 80, a shape corresponding to thecorner portion (the bending hole portion 83, and first and secondrestricting convex portions 84 and 85, which will be described below)and a frame side screw hole 99 are formed. In the state before bendingprocessing of FIG. 12, the bending hole portion 83 takes a substantiallyinverted trapezoidal shape. The height of the inverted trapezoid(distance from a light leakage prevention deep portions 88 a to thefirst and second restricting convex portions 84 and 85) is around 10 mm.Further, the length L of a lower side of the inverted trapezoid is setto be the same as (or slightly longer than) the length corresponding toR of the bending portion. This is for enabling the bending processingappropriately and easily.

Moreover, when the transparent protection cover 30 is arranged in thebending hole portion 83 subjected to cutting-out processing, in order toprevent light leakage of the inside of the liquid crystal television 10,the light leakage prevention deep portion 88 a the predetermined size ofwhich is remained being unprocessed is provided. Note that, after thesecond frame 80 is subjected to the bending processing, the left-sidepart of the bending hole portion 83 serves as a bottom front faceportion 81 extending horizontally and a right-side part thereof servesas a side portion 82 extending vertically.

Further, in an inner part of the bending hole portion 83 (upper-sidepart of FIG. 12), the first restricting convex portion 84 and the secondrestricting convex portion 85 are formed. Specifically, the firstrestricting convex portion 84 extends from the bottom front face portion81 toward the bending hole portion 83. Similarly, the second restrictingconvex portion 85 extends from the side portion 82 toward the bendinghole portion 83. At this time, a restricting face 84 a which is an endportion of the first restricting convex portion 84 takes an angle of 45degrees sloping from upper left to lower right. A restricting face 85 awhich is an end portion of the second restricting convex portion 85takes an angle of 45 degrees sloping from upper right to lower left.That is, a front end of the V-cut shape becomes a large hole (bendinghole portion 83). In addition, in the front cabinet frame 35, a convexedfitting convex portion 39 that has substantially the same shape with theshape of the bending hole portion 83 with a size to be just fit thereinis formed at the position corresponding to the bending hole portion 83,that is, in the four corners in the front face side. The height of thefitting convex portion 39 is set so as to be lower than the top face ofthe frame 20 (the face of the protection cover arranging portion 87) inthe case of being fit. Also with this configuration, positioning andmisalignment prevention are performed reliably.

In addition, as shown in FIG. 13, when the bending processing is carriedout, the restricting face 84 a of the first restricting convex portion84 and the restricting face 85 a of the second restricting projectionportion 85 are abut. With this abutting, the bottom front face portion81 and the side portion 82 form a right angle so as not to be bent anymore. That is, it is possible to perform the bending processing withhigh accuracy, and distortion will not be caused even after the firstframe 70 and the second frame 80 are assembled.

FIGS. 16-18 and FIGS. 19 and 20 show a detailed assembling part of thefirst frame 70 and the second frame 80. The first frame 70 and thesecond frame 80 are connected by the connection member 90 at each of arear face part thereof. In a side portion 72 of the first frame 70 and aside portion 82 of the second frame 80, two frame side screw holes ineach of which, or four frame side screw holes 79 a, 79 b, 89 a and 89 bin total, are formed. Note that, the two frame side screw holes 79 a and79 b are simply represented as a frame side screw hole 79 when notdistinguished. Similarly, the two frame side screw holes 89 a and 89 bare simply represented as a frame side screw hole 89 when notdistinguished. The frame side screw holes 79 a, 79 b, 89 a and 89 b areformed into the partially conical shape corresponding to a flat headscrew 99.

The connection member 90 is obtained by processing, for example, platematerial of aluminum alloys or the like, in which four connection memberside screw holes 92 a and 92 b (simply represented as connection memberside screw holes 92 when not otherwise distinguished) are formed intotal at the positions corresponding to the frame side screw holes 79and 89. Here, as shown in FIG. 19, to the inside two connection memberside screw holes 92 a, an offset ΔX is set to the frame side screw holes79 a and 89 a so as to slightly approach the illustrated verticaldirection, respectively. The offset ΔX is, for example, around from 0.05mm to 0.10 mm. Moreover, as shown in FIG. 20, even for the widthdirection, a predetermined offset ΔY is set to the frame side screwholes (79 a and 79 b) and 89 (89 a and 89 b) and the connection memberside screw holes 92, so that force acts in a direction that theconnection member 90 is pressed against the side portion 82 of thesecond frame 80.

Accordingly, when the first frame 70 and the second frame 80 arefastened by the connection member 90, with the above offsets ΔX and ΔY,force acts on the first frame 70 and the second frame 80 in a directionapproaching each other. Thus, it is possible to correct a state whererestoring force acts on each part of each bending of the first frame 70and the second frame 80 to a direction that an end opens, and tomaintain the assembled state of the frame 20 appropriately.

Now, a summary of effects of the present embodiment is summarized asfollows.

It is possible to generate predetermined R at a bending part of theframe 20 easily as well as to align to the predetermined bending angleaccurately. In addition, when the transparent protection cover 30 isdirectly attached on the frame 20, by a thickly raised part of thecorner part (the light leakage prevention deep portion 88 a), spacewhich allows to visually recognize the inside disappears between thetransparent protection cover 30 and the frame 20 so that componentsunder the frame 20 is not able to be seen. That is, it is possible toput a blindfold without using additional components other than the frame20. When the frame 20 is made, the configuration is such that twomembers in the almost symmetrical shape are fixed, so that force isbrought to four corners uniformly. As a result, it is possible to reducedeformation of a product. Adjustment of the connection member 90 of ajoint portion makes it possible to ensure accuracy of the square frame.

Hereinabove, the present invention has been described on the basis ofthe embodiment. This embodiment provides only an exemplification, andany person with an ordinary skill in the art could understand that, bycombining each of the components thereof, various modified examples canbe made, and such modified examples are also within the scope of thepresent invention.

FIGS. 21 and 22 show plan views of the corner portion of the secondframe 80 according to a modified example, and specifically, FIG. 21shows a state before bending processing of the corner portion and FIG.22 shows a state of the corner portion after processing. As illustrated,a fitting convex portion 84 b is formed on the restricting face 84 a ofthe first restricting convex portion 84. Moreover, a fitting concaveportion 85 b is formed on the restricting face 85 a of the secondrestricting convex portion 85. It is configured such that, when thebending processing is performed, the fitting convex portion 84 b and thefitting concave portion 85 b are just fit. Further, in order to maintainthe fitting state, an engaging piece is formed on the fitting convexportion 84 b and an engaging concave portion which is engaged with theengaging piece is formed on the fitting concave portion 85 b. Here, asillustrated, the engaging piece has a semicircular convex shape in planview and the engaging concave portion has a semicircular concave shape.

In this manner, with the configuration having a function of engagingwhen the first restricting convex portion 84 and the second restrictingconvex portion 85 are subjected to the bending processing, it ispossible to add force against restoring force (counter restoring force)which acts on each part of each bending of the first frame 70 and thesecond frame 80. As a result, the configuration against the aboverestoring force by the connection member 90 is able to be made small,and therefore degree of flexibility in arranging components is improved.Moreover, fitting of the fitting convex portion 84 b and the fittingconcave portion 85 b makes it possible to improve accuracy of thebending processing of the second frame 80 and the like. In addition, byfitting, it is possible to maintain the processing shape appropriatelywhen external force is brought to the second frame 80.

Note that, as shown in FIGS. 23-25, the configuration not having anengaging piece and an engaging concave portion may be employed. In FIG.23, a fitting convex portion 84 c and a fitting concave portion 85 ctake a semicircular shape. In FIG. 24, a fitting convex portion 84 d anda fitting concave portion 85 d take a rectangular shape. In FIG. 25, theshape is such that a fitting convex portion 84 e and a fitting concaveportion 85 e, which have a rectangular shape, are arranged at pluralpoints. Since there is no engaging configuration, the counter restoringforce is smaller than the configuration shown in FIGS. 21 and 22, butconstant counter restoring force is obtained by frictional force.Moreover, with such a configuration, it is possible to make force offitting at the time of the bending processing small.

FIGS. 26 and 27 are perspective views of a modified example of thecorner portion of the second frame 80 and show the modified example ofthe fitting configuration of the bending hole portion 83 and the fittingconvex portion 39 shown in FIG. 11. Specifically, in the front cabinetframe 35, two cylindrical positioning convex portions 39 a and 39 b areformed instead of the fitting convex portion 39. These positioningconvex portions 39 a and 39 b are inserted in a part in the vicinity ofboth sides of the bending hole portion 83. Therefore, a center part ofthe bending hole portion 83 becomes empty. In addition, in the emptypart, a positioning convex portion 31 which is formed in a corner rearface part of the transparent protection cover 30 arranged on the frontface side of the frame 20 (second frame 80) is inserted. That is, in thebending hole portion 83, the two positioning convex portions 39 a and 39b of the front cabinet frame 35 are inserted from the rear face side andthe positioning convex portion 31 of the transparent protection cover 30is inserted from the front face side, respectively. With such aconfiguration, it is also possible to obtain an effect of positioningand misalignment prevention of the transparent protection cover 30.

REFERENCE SIGNS LIST

-   -   10 liquid crystal television    -   20 frame    -   25 positioning projection portion 25    -   30 transparent protection cover    -   31 positioning convex portion    -   35 front cabinet frame    -   37 positioning boss hole 37    -   39 fitting convex portion    -   39 a, 39 b positioning convex portion    -   40 rear cabinet    -   50 sheet group    -   51 liquid crystal panel    -   52 Df sheet    -   53 lens sheet    -   54 light guide plate    -   55 diffusion sheet    -   56 reflection plate    -   60 back light chassis    -   70 first frame    -   79, 89, 79 a, 79 b, 89 a, 89 b frame side screw hole    -   80 second frame    -   81 bottom front face portion    -   82 side portion    -   83 bending hole portion    -   84 first restricting convex portion    -   84 a restricting face    -   84 b to 84 e fitting convex portion    -   85 second restricting convex portion    -   85 a restricting face    -   85 b engaging concave portion    -   85 b to 85 e fitting concave portion    -   86 outer peripheral projection portion    -   87 protection cover arranging portion    -   88 frame side face portion    -   88 a light leakage prevention deep portion    -   90 connection member    -   92, 92 a, 92 b connection member side screw hole    -   99 flat head screw

1. A thin display device provided with a metallic frame, wherein theframe is configured by connecting a plurality of frame members subjectedto bending processing, in a part subjected to the bending processing, ahole portion for bending processing and two restricting means thatrestrict an amount of the bending processing to a predetermined amountby a V-Cut shape separation before the bending processing and byabutting each other at the time of processing are formed, and whereinthe hole portion is configured as a long hole which is long in itslongitudinal direction of the frame before the bending processing, and apart of the fringe of the long hole is configured as the V-cut shapeseparation.